Answer to: How do I fix a corroded battery before it ruins my camera?Actually, a AA battery is alkaline (or a chemical base). So, you want to neutralize it. This can be done with vinegar (a mild acid). Except for the baking soda, the process "posted 5 days ago" is similar. You could use a cotton swab to apply the vinegar with better control/access. Then, use the water-wetted rag for lean up.